path: root/fs/ocfs2/acl.c
diff options
authorJunxiao Bi <>2016-05-12 15:42:15 -0700
committerLinus Torvalds <>2016-05-12 15:52:50 -0700
commit5ee0fbd50fdf1c1329de8bee35ea9d7c6a81a2e0 (patch)
treead5472be43466ea27f8a6804f0de9a8631d67cc6 /fs/ocfs2/acl.c
parent422ce5a97570cb8a37d016b6bc2021ae4dac5499 (diff)
ocfs2: revert using ocfs2_acl_chmod to avoid inode cluster lock hang
Commit 743b5f1434f5 ("ocfs2: take inode lock in ocfs2_iop_set/get_acl()") introduced this issue. ocfs2_setattr called by chmod command holds cluster wide inode lock when calling posix_acl_chmod. This latter function in turn calls ocfs2_iop_get_acl and ocfs2_iop_set_acl. These two are also called directly from vfs layer for getfacl/setfacl commands and therefore acquire the cluster wide inode lock. If a remote conversion request comes after the first inode lock in ocfs2_setattr, OCFS2_LOCK_BLOCKED will be set. And this will cause the second call to inode lock from the ocfs2_iop_get_acl() to block indefinetly. The deleted version of ocfs2_acl_chmod() calls __posix_acl_chmod() which does not call back into the filesystem. Therefore, we restore ocfs2_acl_chmod(), modify it slightly for locking as needed, and use that instead. Fixes: 743b5f1434f5 ("ocfs2: take inode lock in ocfs2_iop_set/get_acl()") Signed-off-by: Tariq Saeed <> Signed-off-by: Junxiao Bi <> Cc: Mark Fasheh <> Cc: Joel Becker <> Cc: Joseph Qi <> Cc: <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'fs/ocfs2/acl.c')
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index 0cdf497c91ef..749d3bc41232 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -322,3 +322,27 @@ struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
return acl;
+int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh)
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct posix_acl *acl;
+ int ret;
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+ return 0;
+ acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
+ if (IS_ERR(acl) || !acl)
+ return PTR_ERR(acl);
+ ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+ if (ret)
+ return ret;
+ ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
+ acl, NULL, NULL);
+ posix_acl_release(acl);
+ return ret;